.login {
    width: 100%;
    height: calc(100vh - 48px);
    background: url(@img/bg.jpg) no-repeat;
    background-size: 100% 100%;
    position: relative;
    & form{
        width: 300px;
        background-color: rgba(255, 255, 255, 0.93);
        margin: 0 auto;
        padding: 18px;
        border-radius: 2px;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
}